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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 639 · 40 questions
TalentJR

The trick (Count the places): Forget the points and multiply the whole numbers. Count all the digits after the points in the question. Put the point that many places from the right, then check by rounding.

NameDateTime takenScore ___ / 40
  1. 1.0.34 × 3 — where does the decimal point go? (a) 0.102 (b) 1.02 (c) 10.2 (d) 0.0102
  2. 2.0.24 × 1.8 — where does the decimal point go? (a) 0.0432 (b) 0.00432 (c) 0.432 (d) 4.32
  3. 3.9.2 × 47 — where does the decimal point go? (a) 4324 (b) 432.4 (c) 4.324 (d) 43.24
  4. 4.0.29 × 2.3 — where does the decimal point go? (a) 0.667 (b) 0.00667 (c) 0.0667 (d) 6.67
  5. 5.1.5 × 39 — where does the decimal point go? (a) 58.5 (b) 0.585 (c) 5.85 (d) 585
  6. 6.1.3 × 0.5 — where does the decimal point go? (a) 0.0065 (b) 0.065 (c) 6.5 (d) 0.65
  7. 7.0.23 × 15 — where does the decimal point go? (a) 0.345 (b) 0.0345 (c) 3.45 (d) 34.5
  8. 8.2.4 × 0.6 — where does the decimal point go? (a) 14.4 (b) 0.144 (c) 0.0144 (d) 1.44
  9. 9.9.4 × 2.2 — where does the decimal point go? (a) 20.68 (b) 206.8 (c) 2.068 (d) 0.2068
  10. 10.3.1 × 3.7 — where does the decimal point go? (a) 0.1147 (b) 1.147 (c) 114.7 (d) 11.47
  11. 11.5.9 × 46 — where does the decimal point go? (a) 271.4 (b) 2.714 (c) 27.14 (d) 2714
  12. 12.5.4 × 0.6 — where does the decimal point go? (a) 32.4 (b) 0.324 (c) 3.24 (d) 0.0324
  13. 13.0.24 × 4 — where does the decimal point go? (a) 0.0096 (b) 0.096 (c) 0.96 (d) 9.6
  14. 14.1.6 × 37 — where does the decimal point go? (a) 59.2 (b) 592 (c) 5.92 (d) 0.592
  15. 15.2.4 × 49 — where does the decimal point go? (a) 117.6 (b) 11.76 (c) 1176 (d) 1.176
  16. 16.0.74 × 2.6 — where does the decimal point go? (a) 19.24 (b) 1.924 (c) 0.01924 (d) 0.1924
  17. 17.1.9 × 0.3 — where does the decimal point go? (a) 5.7 (b) 0.057 (c) 0.0057 (d) 0.57
  18. 18.6.9 × 42 — where does the decimal point go? (a) 289.8 (b) 2.898 (c) 28.98 (d) 2898
  19. 19.3.3 × 5 — where does the decimal point go? (a) 165 (b) 0.165 (c) 1.65 (d) 16.5
  20. 20.1.4 × 0.3 — where does the decimal point go? (a) 0.0042 (b) 4.2 (c) 0.042 (d) 0.42
  21. 21.4.7 × 0.8 — where does the decimal point go? (a) 0.0376 (b) 3.76 (c) 0.376 (d) 37.6
  22. 22.3.7 × 44 — where does the decimal point go? (a) 1.628 (b) 162.8 (c) 1628 (d) 16.28
  23. 23.0.38 × 8 — where does the decimal point go? (a) 0.0304 (b) 0.304 (c) 3.04 (d) 30.4
  24. 24.7.1 × 3 — where does the decimal point go? (a) 213 (b) 0.213 (c) 21.3 (d) 2.13
  25. 25.0.51 × 6 — where does the decimal point go? (a) 0.0306 (b) 3.06 (c) 30.6 (d) 0.306
  26. 26.0.35 × 9 — where does the decimal point go? (a) 0.315 (b) 0.0315 (c) 3.15 (d) 31.5
  27. 27.0.41 × 39 — where does the decimal point go? (a) 15.99 (b) 159.9 (c) 0.1599 (d) 1.599
  28. 28.3.9 × 3.1 — where does the decimal point go? (a) 1.209 (b) 12.09 (c) 120.9 (d) 0.1209
  29. 29.9.2 × 4 — where does the decimal point go? (a) 3.68 (b) 0.368 (c) 36.8 (d) 368
  30. 30.9.6 × 0.8 — where does the decimal point go? (a) 0.768 (b) 7.68 (c) 76.8 (d) 0.0768
  31. 31.0.36 × 0.6 — where does the decimal point go? (a) 0.0216 (b) 2.16 (c) 0.216 (d) 0.00216
  32. 32.0.15 × 2.1 — where does the decimal point go? (a) 0.315 (b) 0.0315 (c) 0.00315 (d) 3.15
  33. 33.0.17 × 2 — where does the decimal point go? (a) 0.34 (b) 0.0034 (c) 3.4 (d) 0.034
  34. 34.8.1 × 4 — where does the decimal point go? (a) 0.324 (b) 3.24 (c) 324 (d) 32.4
  35. 35.5.4 × 0.2 — where does the decimal point go? (a) 0.108 (b) 1.08 (c) 0.0108 (d) 10.8
  36. 36.7.9 × 1.3 — where does the decimal point go? (a) 10.27 (b) 0.1027 (c) 1.027 (d) 102.7
  37. 37.7.2 × 3 — where does the decimal point go? (a) 2.16 (b) 0.216 (c) 21.6 (d) 216
  38. 38.8.5 × 9 — where does the decimal point go? (a) 0.765 (b) 76.5 (c) 765 (d) 7.65
  39. 39.6.3 × 0.3 — where does the decimal point go? (a) 0.189 (b) 0.0189 (c) 18.9 (d) 1.89
  40. 40.0.79 × 0.2 — where does the decimal point go? (a) 0.0158 (b) 1.58 (c) 0.00158 (d) 0.158

Answer key

  1. 1.02
  2. 0.432
  3. 432.4
  4. 0.667
  5. 58.5
  6. 0.65
  7. 3.45
  8. 1.44
  9. 20.68
  10. 11.47
  11. 271.4
  12. 3.24
  13. 0.96
  14. 59.2
  15. 117.6
  16. 1.924
  17. 0.57
  18. 289.8
  19. 16.5
  20. 0.42
  21. 3.76
  22. 162.8
  23. 3.04
  24. 21.3
  25. 3.06
  26. 3.15
  27. 15.99
  28. 12.09
  29. 36.8
  30. 7.68
  31. 0.216
  32. 0.315
  33. 0.34
  34. 32.4
  35. 1.08
  36. 10.27
  37. 21.6
  38. 76.5
  39. 1.89
  40. 0.158

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